\begin{equation} \label{stacks-more-morphisms-equation-diagram} \vcenter { \xymatrix{ T \ar[r]_-x \ar[d]_ i & \mathcal{X} \ar[d]^ f \\ T' \ar[r]^-y \ar@{..>}[ru] & \mathcal{Y} } } \end{equation}
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